CG958G Wheel Loader. Manual - part 37

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Oil in hydraulic tank 

Replace oil. 

Let the machine work for longer hours to heat the oil. 

The machine shall be on level ground, set all working devices in the ground and 

exert downward pressure on them. Close the parking brake and shutdown the engine. 

1．Disassemble the oil filling cap of the hydraulic tank. 

2. Open the vent valve at the bottom of the hydraulic tank and discharge the oil. 

3. Close the vent valve. 

4. Replace the filter of hydraulic system. See “Hydraulic System” in “Maintenance of 

Each 500 Working Hours or Every Season”. 

5. Disassemble the fuel strainer, clean it and install it. 

6. Refuel to the hydraulic tank. See “Viscosity and Full Capacity of Oil”. 

7. Check the gasket of the oil filling cap and replace the damaged gasket. 

8. Fit on the oil filling cap. 

9. Start the engine and run it for a few minutes. 

10. Maintain the hydraulic oil level in the middle of the oil gauge, and if necessary, 

refuel it through the oil filling port. 

11. Shut down the engine. 

Differential gear and final transmission 

Replace oil. 

1. Disassemble the oil drain plug of front axle and rear axle, and discharge the oil. 

2. Clean the oil drain plug and reinstall it. 

3. Disassemble the oil drain plug of front axle and rear axle, refuel the axle through the 

oil filling port till bleeding. See figures and tables in “Viscosity and Full Capacity of 

Oil”. 

4. Install the oil drain plug. Start the engine and let it work for a few minutes. 

Re-check the oil level and refuel to the specified position if necessary. 

5. Install the oil drain plug. 

Service brake system 

Check the preliminary filling pressure of nitrogen gas of the accumulator. 

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Please connect with the appointed maintenance service of the SICHUAN 

CHENGDU CHENGGONG CONSTRUCTION MACHINERY CO.，LTD. to check 

the preliminary filling pressure of nitrogen gas of the accumulator for you. 

 

Caution 

Whether the preliminary filling pressure of nitrogen gas of the accumulator 

is too high or too low will reduce the service life of the accumulator, affect the 

braking performance, and danger the traffic safety by a lot of leakage. 

Check wear-out of wet brake disc. 

1．   Disassemble wear-out of front axle brake disc and check the plug screw. 

2． Disassemble wear-out of rear axle brake disc and check the plug screw. 

3． Measure the depth of the hollow form oil scupper on both sides of the brake disc, 

and gain the remaining time of the brake disc by compared with the following 

table. 

 

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Remaining life 
of braking disc

 

Thickness of 

braking disc 

mm

 

Depth of 

hollow form 

scupper mm

 

100 7.00 

0.64 

80 6.87 

0.57 

60 6.74 

0.51 

40 6.62 

0.45 

20 6.49 

0.38 

0 6.36 

0.32 

4． Fit on the plug screw. 

If necessary to replace the braking disc, please connect with the dealers of the 

SICHUAN CHENGDU CHENGGONG CONSTRUCTION MACHINERY CO., 

LTD.

 

9.10 Maintenance of Each 2000 Working Hours or Every Year 

Before carrying out any operation or maintenance, the warnings and annotations 

in this manual safety chapter shall be read and understood. 

 Firstly carry on the aforementioned examination items 

 Firstly, carry on the aforementioned items. 

Coolant in the cooling system 

Replace the coolant / clean the system. 

Caution

 

Do not replace coolant before reading and understanding the content of the 

chapter “cooling system specification”. 

Replace the coolant as soon as possible when observing the coolant has 

impurities or bubble. 

The radiator cap locates at the top of the rear cover of the machine. 

1． Open the maintenance gate of the radiator. 

2． Slowly loosen the radiator cap and release the pressure. 

3． Open the discharge valve and discharge the coolant. The discharge valve locates at 

the bottom of the radiator. 

4． Close the discharge valve and add system clean water and cleaning liquid of the 

cooling system which concentration is 6%~10%. 

5． Start the engine and run it for 1.5 hours, shutdown it and discharge cleaning liquid. 

6． Shut down the engine and wash the cooling system with clean water till removes 

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all water. 

7． Close the discharge valve. 

8． Add coolant. See also in “cooling system specification” and “Viscosity and Full 

Capacity of Oil”. 

9． Start and run the engine, open the radiator cap, open the thermostat, stable the 

liquid level. 

10． The coolant level shall keep within 1cm under the charging pipe. 

11． Replace damaged lid gasket and fit on the lid. 

12． Shut down the engine.